This Midas shop seems like it does good work, and I've now done two oil changes with them. But I'm not going back, because something happened this last time that made me suspicious. I asked them to rotate the tires in addition to the oil change this time. When they were done, they tried to sell me an alignment, and just afterward I did notice that my car's steering was pulling to one side. But then I discovered that the tire was seriously underinflated. I pumped the tire back up, and now everything is fine.
I don't know that they did anything sleazy, but this sort of thing makes me suspicious, so I'd rather not risk it.